A friend collected some Petoskey stones for me from up north (Petoskey, MI of course!). After spraying with some acrylic spray, I attempted to wire wrap a few for pendants. I was pretty happy with the results! I used 20 ga. sterling silver wire for the wraps.
I also have been trying metal stamping with alphabet stamps and sterling silver blanks. After a couple of (expensive!) mistakes (a "g" can sure look like an "a" when it's backwards!), I attached copper stamped hearts and hung on sterling silver ball chains.